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Rough idle and shuts off only on the first start of the day?

Tiny
JOHN JACOBSON
  • MEMBER
  • 2002 ISUZU RODEO
  • 3.2L
  • 6 CYL
  • 160,000 MILES
First start of the day has rough idle and shuts off, rest of the day no problem.
Wednesday, May 15th, 2024 AT 4:48 AM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
This is typical when the throttle bore needs to be serviced, here is a guide to help with instructions below for your car.

https://www.2carpros.com/articles/throttle-actuator-service

Also, I have seen a bad engine coolant temperature sensor cause the same problem so I would unplug it to see if the problem changes, Check out the images (below). Please upload pictures or videos in your response to any problems so we can see what to help you with.
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Thursday, May 16th, 2024 AT 12:07 PM
Tiny
JOHN JACOBSON
  • MEMBER
  • 4 POSTS
  • 2002 ISUZU RODEO
  • 3.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
The rest of the day starts and runs normally. Throttle body was cleaned and PCV sensor replaced, no help.
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Monday, November 18th, 2024 AT 11:15 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Let's run the codes first to see if any are stored, this guide will help. Also, I have seen a bad engine coolant sensor cause this issue.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

This can be caused by a vacuum leak as well, use this guide when the engine is cold only:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please go over these guides and get back to us.

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Monday, November 18th, 2024 AT 11:15 AM (Merged)
Tiny
JOHN JACOBSON
  • MEMBER
  • 4 POSTS
  • 2002 ISUZU RODEO
  • 3.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
First start in the morning, revs to 2,000 RPMs then drops and burps a few times and shuts off. After I get it going it runs great the rest of the day. Have changed many parts and sensors but to no avail. Only happens with the first start of the day.
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Monday, November 18th, 2024 AT 11:15 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
What parts have you replaced? Did you run the codes?
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Monday, November 18th, 2024 AT 11:15 AM
Tiny
JOHN JACOBSON
  • MEMBER
  • 4 POSTS
2 mechanics have run the codes, and these parts have been replaced. PCV and EGR valves, camshaft pos. Sensor, mass air flow sensor, fuel pump and filter, throttle body cleaned, fuel pressure regulator. Still the same problem has been going on for a long time.
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Monday, November 18th, 2024 AT 12:36 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
I have seen the engine coolant sensor cause this issue and leave no codes. Here is the location of the sensor so you can swap it out. Check out the images (below). Please let us know what happens.
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Tuesday, November 19th, 2024 AT 9:15 AM

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